Abstract Class

What is an abstract method?

• An abstract method is any method in an abstract class.

• An abstract method is a method which cannot be inherited.

• An abstract method is one without a body that is declared with the reserved word abstract.

• n abstract method is a method in the child class that overrids a parent method.

Abstract class can have all of the below except

• Abstract methods

• Methods with code implementation

• Used to create objects

• Used to create subclasses

What should be the code in the blank from the given codes?

public abstract class Person{

public abstract void enroll();

}

public class Student extends Person(

______________________________

{

• public void eat(){

  }

• public void enroll(){

  }

• public void drop(){

  }

• public class Person()

Fill up the correct code in the given program below.

public abstract class BSIT2A{

public _____________ void read();

}

public class Student extends BSIT2A{

public void read(){

}

• static

• final

• abstract

• public

Is the given code below correct?

public class Person{

public abstract void enroll();

}

• Yes

• No

Is the code below correct?

public abstract class Pet{

public abstract void eat();

}

public class Cat extends Pet{

public void eat(){

}

}

• Yes

• No

Is the given code below correct?

public abstract class Person{

public final abstract void draw();

}

public class Student extends Person{

public void draw(){

}

}

• Yes

• No

Is the program code below correct?

public abstract class Person{

public abstract double computeGrade();

}

public class Student extends Person{

public double computeGrade(){

return 90.0;

}

}

• Yes

• No

What is the right code on the blank in the given program below?

public abstract class Pet{

public abstract int getAge();

}

public class Cat __________ Pet{

public int getAge(){

return 5;

}

}

• abstract

• final

• extends

• static